Well, the Hijri date 21 Rabi Al Awwal 1489 corresponds to the Gregorian date Monday, 14 June 2066. This date lies in the third month of the Hijri year 1489 AH, which is Rabi Al-Awwal of 1489 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1489/03/21 is calculated using the Umm Al-Qura calendar and the sighting of the moon. One thing to remember is that this Arabic date may occur on different Gregorian date depending upon the region and country and obviously the moon.
If you are still not sure about the date then you can use our Arabic date converter.
The following is the conversion of the Gregorian date 14 June 2066 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Awwal 1489 AH to its equivalent Gregorian date.
يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ مَن يَرْتَدَّ مِنكُمْ عَن دِينِهِۦ فَسَوْفَ يَأْتِى ٱللَّهُ بِقَوْمٍۢ يُحِبُّهُمْ وَيُحِبُّونَهُۥٓ أَذِلَّةٍ عَلَى ٱلْمُؤْمِنِينَ أَعِزَّةٍ عَلَى ٱلْكَٰفِرِينَ يُجَٰهِدُونَ فِى سَبِيلِ ٱللَّهِ وَلَا يَخَافُونَ لَوْمَةَ لَآئِمٍۢ ۚ ذَٰلِكَ فَضْلُ ٱللَّهِ يُؤْتِيهِ مَن يَشَآءُ ۚ وَٱللَّهُ وَٰسِعٌ عَلِيمٌ
O ye who believe! Whoso of you becometh a renegade from his religion, (know that in his stead) Allah will bring a people whom He loveth and who love Him, humble toward believers, stern toward disbelievers, striving in the way of Allah, and fearing not the blame of any blamer. Such is the grace of Allah which He giveth unto whom He will. Allah is All-Embracing, All-Knowing.
Surah Al-Maaida(5:54)